Venture into the dense forests of coastal Siberia to track the biggest cat on earth, the elusive Siberian Tiger. You'll join a team of Russian and American scientists who are risking their lives to save this highly endangered and highly dangerous creature. Some 300 Siberian tigers survive in the wild, concentrated in a shrinking habitat and under siege from poachers. Against incredible odds, this daring band of wildlife biologists is determined to help the Siberian Tiger fight back. National Geographic cameras are on-hand to record many never-before-seen moments in tiger conservation: Researchers hastily enter a den to tag a two-month-old cub before the mother returns. A female tiger charges up a tree, attempting to attack a hovering helicopter. Team members race to revive a sedated tiger, even giving it mouth-to-mouth resuscitation.